write a script & sum contents!please help




hello everyone!!

i have to write a script in unix that reads a file which is in the format:
1%blabla%30
2%blabla2%50
1%blabla3%40
2%blabla4%10

and produce the total quantities of 1 and 2: "1 = 70 2 = 60"

i am taught basic unix commands, so i must keep it simple, how can i do this using loops? (i am not supposed to use functions)

i suppose that i should extract the 1st and 2nd column from the file, but after that i don't know what to do!!

any help would be appreciated!!!! thank youuuuuuuu!

can you show what you tried?

quote:
originally posted by questionmaker25
(i am not supposed to use functions)


somebody will come and question you because it seems like a homework qns, but nevertheless,

code:

although this sounds like a homework question here is one answer. i am sure you will get more compact answers from those more accustom to awk.

create enttab to contain

1%blabla%30
2%blabla2%50
1%blabla3%40
2%blabla4%10


for name in `cat enttab`
do
echo $name
frst=`echo $name | cut -f 1 -d %`
scnd=`echo $name | cut -f 3 -d %`
echo $frst $scnd

the only thing i can do is cut -f 1,3 -d '%' {filename}
i am a bit lost after that & i am certainly not bored to solve it, i just don't know how to do it!!

quote:
originally posted by johnf
although this sounds like a homework question here is one answer. i am sure you will get more compact answers from those more accustom to awk.

create enttab to contain

1%blabla%30
2%blabla2%50
1%blabla3%40
2%blabla4%10


for name in `cat enttab`
do
echo $name
frst=`echo $name | cut -f 1 -d %`
scnd=`echo $name | cut -f 3 -d %`
echo $frst $scnd
done



i am not familiar to awk anyway!! thanks a lot but i know how to extract the columns. i don't know how to sum the contents of the thrird one!


last edited by questionmaker25 : 2 weeks ago at 05:52 am.

ofcourse it is a homework!!!!
is that so bad to ask for directions? i don't want you to solve the exercise!
i just want you to tell my how to add the numbers of the third column


thank you in advance!

quote:
originally posted by questionmaker25
ofcourse it is a homework!!!!
is that so bad to ask for directions?



yes, asking for help with homework questions is a no-no as per the forum rules.


quote:
originally posted by questionmaker25
i don't want you to solve the exercise!
i just want you to tell my how to add the numbers of the third column



if i tell you how to add numbers of the third column, isn't that the same as solving your exercise?

i will give you a couple of hints: read in the file line by line, get the third column using 'cut', use shell builtin addition (check the man page of your shell) to add the number of the third column.

and i am locking this thread. no more homework posts please.